Decorative lamp



FIG. 1 is a front perspective view of a decorative lamp showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an opposite side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan vie thereof.

The broken line disclosure of lamp shade and cord represents portions of the lamp which form no part of the claimed design. 

CLAIM The ornamental design for a decorative lamp, as shown and described. 